Lithastrinus


Classification: Mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Lithastrinus
Sister taxa: Eprolithus, Radiolithus, Farhania, Lithastrinus, Uniplanarius, Quadrum, Micula, Palaeomicula,

Distinguishing features: Eprolithids with two cycles of five to seven ray-like, curved, wall-cycle elements surrounding a narrow median diaphragm.


Daughter taxa: (blue => in age window 0-800Ma)
Nannolith with two superposed cycles of four ray-like elements with a narrow central diaphragm. One cycle has long narrow rays and the other has much shorter rays.
Lithastrinus with five petaloid wall-elements
Lithastrinus with six twisting petaloid wall-elements surrounding a narrow central area.
Lithastrinus with seven narrow, curving wall-elements surrounding a narrow central area.
Specimens not identified to species level

Taxonomy:

Citation: Lithastrinus Stradner, 1962
Rank: Genus
Type species: Lithastrinus grillii Stradner, 1962.
Synonyms: Astrionis Wilcoxon 1972

Farinacci & Howe catalog pages: Lithastrinus + * , Astrionis *

Distinguishing features: Eprolithids with two cycles of five to seven ray-like, curved, wall-cycle elements surrounding a narrow median diaphragm.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Turonian Stage (52% up, 91.8Ma, in Turonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

Stradner, H. (1962). Über neue und wenig bekannte Nannofossilien aus Kreide und Alttertiär. Sonderabdruck aus den Verhandlungen der Geologischen Bundesanstalt. 2: 363-377. gs


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Lithastrinus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10569 Go to Archive.is to create a permanent copy of this page - citation notes



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